91000053 has 6 divisors (see below), whose sum is σ = 131444534. Its totient is φ = 60666696.

The previous prime is 91000051. The next prime is 91000081. The reversal of 91000053 is 35000019.

It can be written as a sum of positive squares in only one way, i.e., 65173329 + 25826724 = 8073^2 + 5082^2 .

It is not a de Polignac number, because 91000053 - 2¹ = 91000051 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91000051) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5055550 + ... + 5055567.

Almost surely, 2^91000053 is an apocalyptic number.

It is an amenable number.

91000053 is a deficient number, since it is larger than the sum of its proper divisors (40444481).

91000053 is a wasteful number, since it uses less digits than its factorization.

91000053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10111123 (or 10111120 counting only the distinct ones).

The product of its (nonzero) digits is 135, while the sum is 18.

The square root of 91000053 is about 9539.3947921239. The cubic root of 91000053 is about 449.7942318502.

The spelling of 91000053 in words is "ninety-one million, fifty-three", and thus it is an aban number and an uban number.